Container for liquid

Abstract: A container for a liquid comprising a soft, inner container (1) for containing the liquid and a rigid, outer container (2), the inner container (1) being disposed within the outer container (2), both containers (1, 2) having a discharge port (3) common to each other, approximately half from the discharge port side of each of faces (1c, 1d, 1e, 1f) of the inner container (1) adjacent to the face (1a) with the discharge port (3) formed therein are bonded to the outer container (2).

Description: BACKGROUND OF THE INVENTION The present invention relates to a container for a liquid and more particularly to a container effective for a liquid having a high viscosity. As a container for a liquid there has been known, as shown in Fig. 13, a bag-in-box type container (hereinafter referred to as "BIB container") comprising a rigid, outer container 50 formed of a hard paperboard and a soft, inner container (inner bag) 51 constituted by a flexible bag and disposed within the outer container. In the BIB container, the outer container 50 protects the container against external impact, etc. while retaining a predetermined box shape, and by contraction of the inner container 51, a liquid 52 as the contents of the inner container 51 can be withdrawn from a discharge port 53. In the case where a liquid having a high viscosity, e.g. ink, is contained in the BIB container, it can be withdrawn from the inner container 51 by providing a suction nozzle in the portion of the discharge port 53 and by suction of the liquid using a pump or the like. In the conventional BIB container, however, the inner bag 51 is deformed irregularly during withdrawal of the liquid 52 from the interior of the container, resulting in that, as shown in Fig. 13, portions of the inner bag 51 adhere closely to each other to create an independent compartment 54 within the inner bag and that the liquid 52 in the compartment 54 stays therein without being withdrawn, and the amount thereof is not constant. In the case of liquid suction using a pump, there arises unevenness between the amount of liquid discharged in the initial stage and that in the latter-half stage, and thus it has so far been impossible to withdraw the liquid from the inner bag in a constant volume from beginning to end. The present invention has been accomplished in view of the above-mentioned problems and it is the object of the invention to provide a container for a liquid capable of withdrawing the liquid uniformly from beginning to end without staying in the container and while preventing close adherence of portions of an inner container. EP-A-0 453 172 discloses a container according to the preamble of claim 1. The present invention is characterized by the features of the characterizing portion of claim 1. Optional features are recited in the remaining claims. In the above liquid containers of the present invention, an edge portion defined by unbonded faces of the inner container may be set larger in the radius of curvature than that defined by the bonded faces. A corner of the side where an unbonded portion of the inner container is present or a corner where unbonded portions are in contact with each other has a radius of curvature, and when the inner container is deformed by flowing of the contents thereof, the deformed portion gets into the undeformed portion, but since the edge portion defined by the non-contacted faces is larger in the radius of curvature than the edge portion defined by the contacted faces, a gap is formed between the deformed portion and the undeformed portion, whereby it is made possible to ensure a sufficient flowing path of the contents up to the discharge port. The liquid container of the present invention, may have a plurality of protuberances formed on the face with the discharge port present in positions around the same port or on a face which comes into opposition to the said face upon deformation, so even when the deformed portion gets inside the undeformed portion in the course of withdrawal of the contents from the discharge port, close adherence of the inner wall surfaces at the potion of the discharge port is prevented by the protuberances and gaps are formed in the container. Moreover, since a sufficient flowing path of the contents is ensured around the discharge port, the contents can be withdrawn in a constant volume and with little residue from beginning to end. When the plurality of inward protuberances are formed on substantially the whole of an undeformed portion including a face where a discharge port is present and corresponding to about one half of the entirety or on substantially the whole of a deformed portion other than the undeformed portion, even if the deformed portion is deformed along the inside of the undeformed portion, close adherence of the inner wall surfaces at the portion of the discharge port is prevented by the protuberances, and gaps are formed in the container, so that a sufficient flowing path of the contents is ensured not only around the discharge port but also in the portion up to the same port. When the amount of projection or the spacing of the protuberances is smaller as the distance from the discharge port becomes shorter, the amount of the contents withdrawn near the discharge port is limited to a certain extent to keep the degree of decrease uniform with respect to the contents of the container. When the amount of projection or the spacing of the protuberances is larger as the distance from the discharge port becomes shorter, it is possible to withdraw a larger amount of contents from the discharge port while ensuring a sufficient amount of contents around the same port. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1(a) is a perspective view of a container for a liquid which is not according to the present invention but is useful in understanding the present invention; Fig. 1(b) is a perspective view of the container with the contents thereof removed completely; Fig. 1(c) is a sectional view of the container, showing states before and after removal of the contents; Fig. 2(a) is a perspective view of a container for a liquid according to a first embodiment of the present invention; Fig. 2(b) is a perspective view of the container with the contents thereof removed completely; Fig. 2(c) is a sectional view of the container, showing states before and after removal of the contents; Fig. 3(a) is a view showing a container for a liquid which is not according to the present invention but also useful in understanding the present invention; Fig. 3(b) is a sectional view of the container, showing states before and after removal of the contents; Fig. 4(a) is a perspective view of a container for a liquid according to a second embodiment of the present invention; Fig. 4(b) is a perspective view of the container with the contents thereof removed completely; Fig. 4(c) is a sectional view of the container, showing states before and after removal of the contents; Fig. 5 comprises a front view and a perspective view, illustrating another shape of a cubic container to which the present invention can be applied; Fig. 6(a) is a perspective view of a container for a liquid which is not according to the present invention but is also useful in understanding the present invention; Fig. 6(b) is a sectional view of the container with the contents thereof removed completely; Fig. 7(a) is a perspective view of a container for a liquid which is not according to the present invention but is also useful in understanding the present invention; Fig. 7(b) is a sectional view of the container with the contents thereof removed completely; Fig. 8(a) is a perspective view of a container for a liquid according to a third embodiment of the present invention; Fig. 8(b) is a sectional view of the container with the contents thereof removed completely; Fig. 9(a) is a view showing a further container for a liquid, which is not according to the present invention but is also useful in understanding the present invention; Fig. 9(b) is a partially enlarged sectional view of the container; Fig. 10(a) is a view showing a yet further container for a liquid, which is not according to the present invention but is also useful in understanding the present invention; Fig. 10(b) is a partially enlarged sectional view of the container; Fig. 11 is a view showing another arrangement example of protuberances in a container for a liquid, which is not according to the present invention but is also useful in understanding the present invention; Fig. 12 is a view showing further examples of protuberances in a container for a liquid which is not according to the present invention but is also useful in understanding the present invention; and Fig. 13 is a view showing an example of a conventional container for a liquid which is not according to the present invention but is also useful in understanding the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS Fig. 1(a) is a perspective view of a container for a liquid but which is not according to the present invention; Fig. 1(b) is a perspective view of the container with the contents thereof removed completely; and Fig. 1(c) is a sectional view of the container, showing states before and after removal of the contents. The container for a liquid of Figs 1(a) to 1(c) is a BIB container comprising an inner container 1 and an outer container 2. The inner container 1, which is in the shape of a square cube, is formed by a material having flexibility such as a vinyl resin for example. In the inner container 1 is contained any of low to high viscosity liquids, including ink as a high-viscosity liquid, according to an intended use. A discharge port 3 for discharging the contents of the container to the exterior is formed in one face 1a out of six faces of the inner container 1. Surfaces of the inner container, more specifically, four surrounding faces 1c, 1d, 1e and 1f which are in contact with the face 1a with the discharge port 3 formed therein, are partially bonded to the outer container 2. As indicated with hatches in Fig. 1(a), faces 4 of the bonded portions extend from the face 1a side with the discharge port 3 formed therein up to half of the height of the faces 1c, 1d, 1e and 1f. Consequently, an undeformed portion EA on the face 1a side where the discharge port 3 is present and a deformable portion EB on a face 1b side opposed to the face 1a have similar figures on both sides of a plane E1 which includes a center of gravity G parallel to the face 1a. In a completely removed state of the contents of the inner container 1 from the discharge port 3, the deformable portion EB gets into the undeformed portion EA along the inside of the portion EA, as shown in Figs. 1(b) and 1(c). The outer container 2 is formed by a rigid material such as a hard cardboard or the like so as to cover the whole of the inner container 1 exclusive of the discharge port 3. Bonding of the inner container 1 to the outer container 2 is to an easily separable extent so as to permit sorting at the time of discard. In the container for a liquid constructed as above, when a suction nozzle (not shown) is attached to the discharge port 3 and an external force is applied to the container by the suction force of a pump or the like, there occurs deformation toward the undeformed portion EA and the deformable portion EB slackens and is deformed irregularly to an extent corresponding to a decrease in volume of the contents of the container. This slack becomes maximum when half of the contents has been removed. With further removal of the contents, the deformable portion EB gets into the undeformed portion EA along the inside of the undeformed portion. With subsequent further removal of the contents, the aforesaid slack of the deformable portion EB diminishes gradually and until when the contents are removed nearly completely, portions of the inner container 1 are prevented from adhering closely to each other, thus making it possible to ensure a flowing path of the contents sufficiently without blocking of the discharge port 3. Accordingly, the contents can be withdrawn uniformly and with little residue from beginning to end. If the height of the bonded faces 4 is set larger even slightly than half of the height of the faces 1c, 1d, 1e and 1f, a gap S is formed between the deformable portion EB and the undeformed portion EA, thereby permitting a flowing path of the contents to be ensured sufficiently near the discharge port 3 and permitting removal of the contents without residue. The size of the gap S can be adjusted according to the bonded faces 4. As to the face 1a with the discharge port 3 formed therein, since it is held by the outer container 2 which is in close contact with the inner container 1, no special bonding is needed, but bonding thereof will bring about a more outstanding effect. Fig. 2(a) is a perspective view of a container for a liquid according to a first embodiment of the present invention, Fig. 2(b) is a perspective view of the container with the contents thereof removed completely, and Fig. 2(c) is a sectional view of the container, showing states before and after removal of the contents. The container of this embodiment is a modification of the container shown in Fig. 1, with a difference residing in the bonded portion. As indicated with hatches in Fig. 2(a), bonded faces 7 comprise a face 1a with a discharge port 3 formed therein, a face 1e which is in contact with the face 1a, and triangular portions, being on the side of discharge port 3, of faces 1d and 1f which are in contact with the faces 1a and 1e. Consequently, an undeformed portion EC on the face 1a side with the discharge port 3 formed therein and a deformable portion ED on the side of a face 1b opposed to the face 1a have similar figures on both sides of a diagonal plane E2 including a center of gravity G which is at an angle of 45° relative to the face 1a. In the container of this embodiment, as the contents of the container are removed, the deformable portion ED on the unbonded face side is deformed toward the undeformed portion EC on the side of the bonded face 7. The deformable portion ED slackens and is deformed irregularly to an extent corresponding to the decrease in volume of the container contents, but after half of the contents has been removed, the deformable portion ED gets into the undeformed portion EC along the inside of the undeformed portion EC gradually deeply with removal of the contents, so that the aforesaid slack of the deformable portion ED diminished gradually. Thus, until complete removal of the contents, portions of the inner container 1 are prevented from adhering closely to each other and it is possible to ensure a flowing path of the contents sufficiently without blocking of the discharge port 3, thus making it possible to withdraw the contents uniformly and with little residue from beginning to end. Fig. 3(a) is a view showing a container for a liquid which is not according to the present invention, and Fig. 3(b) is a sectional view of the container, showing states before and after removal of the contents. In the liquid container, as compared with the liquid container of the construction shown in Fig. 1, the radius of curvature (hereinafter referred to as "R") of an edge portion 5 defined by the faces of unbonded portion of inner container 1 is made larger than that of an edge portion 6 defined by the faces of bonded portions. In this container, when the inner container 1 is deformed by flowing of the contents thereof in the course of removal of the contents from the discharge port 3, a deformable portion EB gets into an undeformed portion EA on a bonded face 4 side because bonded faces 4 are incapable of being deformed. But since the corner portion 5 defined by unbonded faces is larger in R than the corner portion 6 defined by bonded faces 4, a gap S is formed between both corner portions, whereby close adherence between portions of the inner container 1 is sure to be prevented and it is possible to ensure a sufficient flowing path of the contents up to the discharge port 3. Fig. 4(a) is a perspective view of a container for a liquid according to a second embodiment of the present invention, Fig. 4(b) is a perspective view of the container with the contents thereof removed completely, and Fig. 4(c) is a sectional view of the container, showing states before and after removal of the contents. In the liquid container of this embodiment, which is a modification of the liquid container shown in Fig. 2, a face 1a of an inner container 1 with a discharge port 3 formed therein and any one of faces (1c, 1d, 1e, 1f) which are in contact with the face 1a, namely two faces, are bonded to an outer container 2. An edge portion 8 defined by unbonded faces of the inner container 1 is larger in R than an edge portion 9 defined by the bonded faces 10. In this embodiment, as the contents of the container are withdrawn from the discharge port 3 while diagonal portions L of both-side faces 1d and 1f which are in contact with both bonded faces 10 are held by the outer container 2, a deformable portion EF on the face lb side opposed to the face 1a with the discharge port 3 formed therein gets into an undeformed portion EE on the discharge port 3 side. Consequently, even without special bonding of both-side faces 1d and 1f which are in contact with both bonded faces 10 as indicated with hatches in the drawing, the diagonal portions L of the faces 1d and 1f can be held by the outer container 2, whereby it is made possible to minimize the number of faces and bonding area of the inner container 1 with respect to the outer container 2. When the deformable portion EF gets into the undeformed portion EE on the bonded face 10 side in the course of removal of the contents, a gap S is formed between the edge portion 8 on the unbonded face side and the edge portion 9 on the bonded face 10 side, so that, as in the liquid container shown in Fig. 2, close adherence between portions of the inner container 1 is sure to be prevented and it is possible to ensure a flowing path of the contents sufficiently up to the discharge port 3. In the present embodiment the inner container is in the shape of a square cube. In each of the above embodiments, moreover, it is not necessary that the bonded faces 4, 7 and 10 be bonded over the whole faces thereof to the outer container if only they are not deformed. Those faces may be bonded to the outer container at plural points including corners thereof or in the form of a belt. Within the liquid container according to the present invention, the whole of the soft inner container is divided into two portions which are deformation portion and undeformed portion, and as the contents of the container are withdrawn from the discharge port, only the deformable portion gets into the undeformed portion gradually deeply along the inside of the undeformed portion. At this time, the deformation of the deformable portion is restricted by the undeformed portion to prevent close adherence between portions of the inner container, thereby permitting a sufficient flowing path of the container contents to be ensured. Therefore, the load on the suction pump can be reduced and it is possible to withdraw the contents uniformly from beginning to end. Besides, because of no unexpected residue, it is possible to withdraw a predetermined amount of the contents completely and surely. Further, since a corner where a unbonded portion is present or a corner where unbonded faces are in contact with each other is in a shape having R, in the inner container, a sufficient gap is formed between the deformable portion and the undeformed portion of the inner container, whereby close adherence between portions of the inner container can be prevented surely and it is possible to ensure a sufficient flowing path of the container contents up to the discharge port. In the present invention, the container is in the form of a cube which may be a cubic container 10 as shown in Fig. 5 capable of being divided into two portions in axial symmetry by an imaginary plane indicated at E3 or E4. Fig. 6(a) is a perspective view of a further container for a liquid which is not according the present invention, and Fig. 6(b) is a sectional view of the container with the contents thereof removed completely. This liquid container is a single container corresponding to the inner container of a BIB container for any of low to high viscosity liquids, including printing ink as a high-viscosity liquid, according to an intended use. The whole of the container, indicated at 11, is formed in the shape of a square cube using a material having flexibility such as vinyl resin or the like. In the container 11, a face 11a wherein is formed a discharge port 2 for discharge of the container contents and approximately one-half portions from the face 11a of faces 11c, 11d, 11d and 11f which are in contact with the face 11a, are used as an undeformed portion EA, while the other portion than the undeformed portion EA is used as a deformable portion EB, and the wall thickness of the deformable portion EB is made smaller than that of the undeformed portion EA, whereby the deformable portion EB is made less rigid than the undeformed portion EA relatively so that as the contents are withdrawn, the deformable portion bends and gets into the undeformed portion EA along the inside of the undeformed portion. Around a discharge port 12 formed in the face 11a there are provided a plurality of semispherical inward protuberances 13 comprising concaves 13a and convexes 13b. In the liquid container constructed as above, when a suction nozzle (not shown) is attached to the discharge port 12 and an external force is applied to the container 11 by the suction force of a pump or the like, the deformable portion EB is deformed while getting in toward the inner wall surfaces of the undeformed portion EA and the contents of the container 11 are withdrawn from the discharge port 12. With removal of the contents, the inner wall surfaces of the deformable portion EB approach. the inner wall surfaces of the undeformed portion EA, resulting in that gaps S which are in communication with the discharge port 12 are formed like meshes around the discharge port by means of the protuberances 13. Consequently, close adherence of the inner wall surfaces at the portion of the discharge port 12 is prevented and it is possible to ensure a sufficient flowing path of the contents around the discharge port, thus permitting the contents to be withdrawn uniformly and with little residue from beginning to end. When the contents are discharged through the discharge port 12, the resistance to the flow of the contents is small because the shape of the protuberances 13 are in a semispherical shape, so that the contents can be conducted smoothly to the discharge port 12. Fig. 7(a) is a perspective view of a container for a liquid which is not according to the present invention, and Fig. 7(b) is a sectional view of the container with the contents thereof removed completely, in which the portions common to Fig. 6 are indicated by the same reference numerals as in Fig. 6. The whole of this container, indicated at 11, is formed in the shape of a square cube using a material having flexibility such as vinyl resin or the like. In the container 11, a face 11a with a discharge port 12 formed therein and approximately one-half portions from the face 11a of faces 11c lid, lie and 11f which are in contact with the face 11a, are used as an undeformed portion EA, while the other portion than the portion EA is used as a deformable portion EB, and the wall thickness of the deformable portion EB is made smaller than that of the undeformed portion EA, whereby the rigidity of the deformable portion EB is made relatively weaker than that of the undeformed portion EA, so that with removal of the contents, the deformable portion EB bends and gets into the undeformed portion EA along the inside of the undeformed portion. Further, a plurality of semispherical inward protuberances 13 comprising concaves 13a and convexes 13b are formed throughout the undeformed portion EA. In this embodiment, as is the case with the liquid container shown in Fig. 6, when a suction nozzle (not shown) is attached to the discharge port 12 and an external force is exerted on the container 1 by the suction force of a pump or the like, the deformable portion EB is deformed while getting in toward the inner wall surfaces of the undeformed portion EA, and the contents of the container 11 are discharged from the discharge port 12. When the inner wall surfaces of the deformable portion EB approach the inner wall surfaces of the undeformed portion EA with removal of the contents, gaps S which are in communication with the discharge port 12 are formed like meshes within the container 11 by means of the protuberances 13. Consequently, close adherence between the inner wall surfaces of the container 11 is prevented and it is possible to ensure a flowing path of the contents sufficiently. Fig. 8(a) is a perspective view of a container for a liquid according to a third embodiment of the present invention, and Fig. 8(b) is a sectional view of the container with the contents thereof removed completely, in which the portions common to Fig. 6 are indicated by the same reference numerals as in Fig. 6. According to this embodiment, in a container 11 which is in the shape of a square cube, protuberances 13 are formed on a face 11a with a discharge port 12 formed therein and also on another face 11c which is in contact with the face 11a. The wall thickness of other faces 11b, lid lie and 11f is made smaller than that of the faces 11a, 11c, whereby the rigidity of a deformable portion EB on the face 11b side is made relatively weaker than that of an undeformed portion EA on the face 11a side with the base H2 of a triangle as a boundary which triangle include the faces 11a and 11c as equilateral. In this embodiment, when a suction nozzle (not shown) is attached to the discharge port 12 and an external force is exerted on the container 11 by the suction force of a pump or the like, the deformable portion EB not including the protuberances 13 is deformed while the inner wall of the face 11b opposed to the face 11a with the discharge port 12 formed therein gets in toward the inner wall of the face 11a with the base H2 as a boundary, whereby the contents of the container 11 can be discharged from the discharge port 12. Even when the inner wall of the face lie approaches the inner wall of the face 11a with the discharge port 12 formed therein as the contents of the container are discharged, gaps S are formed by the protuberances 13, so that close adherence between the inner wall surfaces of the container 11 is prevented and it is possible to ensure a flowing path of the container sufficiently. Fig. 9(a) is a view showing a container for a liquid which is not according to the present invention, and Fig. 9(b) is a partially enlarged sectional view of the container, in which the portions common to Fig. 6 are indicated by the same reference numerals as in Fig. 6. The protuberances 13 are formed in the container, indicated at 11, radially around a discharge port 12 in such a manner that the projecting degree of the protuberances 13 and the spacing thereof (center-to-center distance) are smaller as the distance from the discharge port 12 becomes shorter. While the contents of the container are discharged from the discharge port 12 and as the inner wall of a face 11b opposed to a face 11a with the discharge port formed therein approaches the inner wall of the face 11a, the amount of the container contents to be discharged is restricted to some extent in the vicinity of the discharge port 12 to keep the diminishing degree of the container contents uniform. This construction is effective for a soft ink which is easy to pass through the discharge port. Fig. 10(a) is a view showing a container for a liquid which is not according to the present invention, and Fig. 10(b) is a partially enlarged sectional view of the container, in which the portions common to Fig. 6 are indicated by the same reference numerals as in Fig. 6. The protuberances 13 are formed in the container, indicated at 11, radially around a discharge port 12 in such a manner that their projecting degree and spacing are larger as the distance from the discharge port 12 becomes shorter. While the container contents are discharged from the discharge port 12 and as the inner wall surface of a face 11b opposed to a face 11a with the discharge port 12 formed therein approaches the inner wall of the face 11, it is possible to withdraw a larger amount of the container contents from the discharge port 12 while ensuring a sufficient amount of the contents around the discharge port. This construction is effective for a hard ink which is difficult to pass through the discharge port 12. Although in each of the above embodiments the rigidity of the undeformed portion EA is made relatively stronger than that of the deformable portion EB, there may be adopted another suitable method for creating such a difference in rigidity, for example a method of selecting suitable materials and a method of laminating another member to the portion to be enhanced rigidity (if protuberances 13 are arranged in an alternate fashion, the rigidity will be further enhanced). As a positional modification of the protuberances 13 from those illustrated in the above embodiments, the protuberances may be provided on the face opposed to the protuberance-bearing face in the illustrated embodiments when the deformable portion EB is deformed along the undeformed portion Ea. Moreover, if the protuberances 13 are formed regularly so as to form a linear gap S toward the discharge port 12, the resistance to the flow of the container contents will be reduced, resulting in that the flow becomes smoother and the load on the pump can be diminished. Although the container according to each of the above embodiments is constituted by only the inner container in the conventional BIB container, it goes without saying that an outer container may be provided so as to cover the said container except the discharge port as in the BIB container. In this case, by fixing the undeformed portion RA to the outer container, the rigidity of the undeformed portion EA can be made relatively stronger than that of the deformable portion EB, so the whole of the container can be constituted uniformly using the same material or member without the need of providing a difference in wall thickness between the undeformed portion EA and the deformable portion EB or the need of using different materials. Further, although in each of the above embodiments the container is in the form of a cube, there may be adopted other shapes, including rectangular parallelepiped, prism, cylinder, sphere, as well as a cubic container capable of being divided into two portions in axial symmetry by an imaginary plane indicated at E3 or E4. Although the protuberances 13 described above are semispherical for minimizing the resistance to the flow of the contents, the shape of the protuberances may be a polygonal shape such as, for example, triangle or square depending on the viscosity of the container contents, whereby the resistance to the flow of the contents can be varied according to the contents' viscosity. As shown in Fig. 12(a), the protuberances 13 may be semispherical cavities 23 each sealed independently and formed by laminating an auxiliary member 22 to a base member 21 as a constituent of the container 11 by welding for example. Further, as shown in Fig. 12(b), the base member 21 as a constituent of the container 11 may be rendered thick in a semispherical shape to form semispherical protuberances 13. As set forth above, where the liquid container is constituted by a soft, deformable member having protuberances around the contents discharge port, it is possible to prevent close adherence of inner wall surfaces in the vicinity of the discharge port and hence possible to ensure a sufficient flowing path of the container contents around the discharge port, thus permitting the contents to be discharged in uniform volume and with little residue from beginning to end. Where the liquid container is constituted by a soft, deformable member having protuberances on approximately one-half of the face wherein the discharge port is formed, close adherence of inner wall surfaces at the discharge port portion can be prevented and it is possible to ensure a sufficient flowing path of the container contents not only around the discharge port but also up to the same port, thus permitting the contents to be discharged in uniform volume and with little residue from beginning to end. If the projecting degree or spacing of protuberances is made smaller as the distance from the discharge port becomes shorter, the amount of the contents to be discharged in the vicinity of the discharge port is limited to some extent, whereby it is made possible to keep the diminishing degree of the container contents uniform. This arrangement is effective for a soft ink which is easy to pass through the discharge port. Where the projecting degree or spacing of protuberances is made larger as the distance from the discharge port becomes shorter, it is possible to ensure a sufficient amount of the container contents around the discharge port and hence possible to withdraw a larger amount of the contents from the discharge port. This arrangement is effective for a hard ink which is difficult to pass through the discharge port.

Claims: A container for a fluid comprising: an outer container (2) substantially in the form of a cube; an inner container (1) substantially in the form of a cube for containing said fluid therein disposed in said outer container (2); a discharge port (3) formed in said inner container (1) for discharging said fluid outside said outer container (2), the outer container (2) covering the whole of the inner container (1) exclusive of the discharge port (3); and wherein a portion of said inner container (1) is bonded to said outer container (2) so that a half portion (EA,EC) on the side of said discharge port (3) is undeformable and a half portion (EB,ED) is deformable, said deformable portion (EB,ED) gets into said undeformable portion (EA,EC) along the inside of said undeformable portion (EA,EC) when said fluid in said inner container (1) is ejected through said discharge port (3); characterised in that said discharge port (3) is formed in a first face (1a) of said inner container (1) and located in a position adjacent to a second face (1e) which is adjacent to the first face (1a) where said discharge port (3) is formed and in that there is a substantially triangular bonded portion on each of the faces (1d, 1f) on the inner container (1) to the side of the discharge port (3) which are facing each other and in contact with both the first and second faces (1a,1e), wherein substantially halves of said faces (1d,1f) are bonded to said outer container (2) A container as claimed in claim 1 in which at least one portion of said face (1a) where said discharge port (3) is formed and at least one portion of said face (1e) which is adjacent to said face (1a) are fixed to said outer container (2). A container for a fluid according to claim 1 or 2, wherein the radius of curvature of an edge portion defined by unbonded faces (1b,1c,1d,1f) of said inner container (1) is larger than that of an edge portion defined by bonded faces (1a,1e,1d,1f).

Inventors: TAKEMURA TORU, YAMAMOTO YASUO, TAKEMURA, TORU, YAMAMOTO, YASUO
Applicants: RISO KAGAKU CORP, RISO KAGAKU CORPORATION
Application year: 1994
Main classification: B65D77
IPC codes: B65D83, B65D77